My husband abandoned me on our wedding anniversary

My husband just up and left. It’s been 83 days. He has completely ghosted me and changed his phone number. I’m just in disbelief how someone can do this to their wife. I’ve been hospitalized over my depression from all this and I’m in intensive therapy. But I can’t get over the abandonment. I am struggling to function everyday. There were no signs he was going to leave, no fights. He just up and left. His stuff was gone when I got home from work, no note or anything. But I found an unopened anniversary card he got for me sitting on a shelf.